﻿//
// System.Security.Cryptography KeySizes Class implementation
//
// Authors:
//	Matthew S. Ford (Matthew.S.Ford@Rose-Hulman.Edu)
//	Ben Maurer (bmaurer@users.sf.net)
//	Sebastien Pouliot (sebastien@ximian.com)
//
// Copyright 2001 by Matthew S. Ford.
// Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System.Runtime.InteropServices;

namespace Mono.Security.Cryptography
{

#if !NET_2_1
    [ComVisible(true)]
#endif
    public sealed class KeySizes
    {
        private int _maxSize;
        private int _minSize;
        private int _skipSize;

        public KeySizes(int minSize, int maxSize, int skipSize)
        {
            _maxSize = maxSize;
            _minSize = minSize;
            _skipSize = skipSize;
        }

        public int MaxSize
        {
            get { return _maxSize; }
        }

        public int MinSize
        {
            get { return _minSize; }
        }

        public int SkipSize
        {
            get { return _skipSize; }
        }

        internal bool IsLegal(int keySize)
        {
            int ks = keySize - MinSize;
            bool result = ((ks >= 0) && (keySize <= MaxSize));
            return ((SkipSize == 0) ? result : (result && (ks % SkipSize == 0)));
        }

        internal static bool IsLegalKeySize(KeySizes[] legalKeys, int size)
        {
            foreach (KeySizes legalKeySize in legalKeys)
            {
                if (legalKeySize.IsLegal(size))
                    return true;
            }
            return false;
        }
    }
}
